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Regulation of RcsA by the ClpYQ (HslUV) protease in Escherichia coli

Department of Agricultural Chemistry, Bldg 2, R311, National Taiwan University, Taipei (106), Taiwan, ROC

Correspondence
Whi Fin Wu
whifinwu{at}ccms.ntu.edu.tw

Escherichia coli ClpYQ protease and Lon protease possess a redundant function for degradation of SulA, a cell division inhibitor. An experimental cue implied that the capsule synthesis activator RcsA, a known substrate of Lon, is probably a specific substrate for the ClpYQ protease. This paper shows that overexpression of ClpQ and ClpY suppresses the mucoid phenotype of a lon mutant. Since the cpsB (wcaB) gene, involved in capsule synthesis, is activated by RcsA, the reporter construct cpsB–lacZ was used to assay for -galactosidase activity and thus follow RcsA stability. The expression of cpsB–lacZ was increased in double mutants of lon in combination with clpQ or/and clpY mutation(s) compared with the wild-type or lon single mutants. Overproduction of ClpYQ or ClpQ decreased cpsB–lacZ expression. Additionally, a P_BAD–rcsA fusion construct showed quantitatively that an inducible RcsA activates cpsB–lacZ expression. The effect of RcsA on cpsB–lacZ expression was shown to be influenced by the ClpYQ activities. Moreover, a rcsA^Red–lacZ translational fusion construct showed higher activity of RcsA^Red–LacZ in a clpQ clpY strain than in the wild-type. By contrast, overproduction of cellular ClpYQ resulted in decreased -galactosidase levels of RcsA^Red–LacZ. Taken together, the data indicate that ClpYQ acts as a secondary protease in degrading the Lon substrate RcsA.

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